nice

Adjust the current process’s scheduling niceness by $incr.

Synopsis

POSIX::nice(5);   # lower priority

What you get back

The new niceness value. When the new value genuinely is 0, returns the string "0 but true" to distinguish it from error. On error, returns undef and sets $!.

Edge cases

• Positive increments lower priority; only root can pass negative values to raise priority.

Differences from upstream

Fully compatible with upstream POSIX.